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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한국우주과학회 Journal of Astronomy and Space Sciences Journal of Astronomy and Space Sciences 제36권 제3호
- 발행연도
- 2019.1
- 수록면
- 159 - 168 (10page)
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In solstices during the solar minimum, the hemispheric difference of the equatorial ionization anomaly (EIA) intensity (hereafter hemispheric asymmetry) is understood as being opposite in the morning and afternoon. This phenomenon is explained by the temporal variation of the combined effects of the fountain process and interhemispheric wind. However, the mechanism applied to the observations during the solar minimum has not yet been validated with observations made during other periods of the solar cycle. We investigate the variability of the hemispheric asymmetry with local time (LT), altitude, season, and solar cycle using the electron density taken by the CHAllenging Minisatellite Payload satellite and the global total electron content (TEC) maps acquired during 2001–2008. The electron density profiles provided by the Constellation Observing System for Meteorology, Ionosphere, and Climate satellites during 2007–2008 are also used to investigate the variation of the hemispheric asymmetry with altitude during the solar minimum. During the solar minimum, the location of a stronger EIA moves from the winter hemisphere to the summer hemisphere around 1200–1400 LT. The reversal of the hemispheric asymmetry is more clearly visible in the F-peak density than in TEC or in topside plasma density. During the solar maximum, the EIA in the winter hemisphere is stronger than that in the summer hemisphere in both the morning and afternoon. When the location of a stronger EIA in the afternoon is viewed as a function of the year, the transition from the winter hemisphere to the summer hemisphere occurs near 2004 (yearly average F10.7 index = 106). We discuss the mechanisms that cause the variation of the hemispheric asymmetry with LT and solar cycle.
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참고문헌 (43)
참고문헌 신청
EDWARD V. APPLETON / 1946 / Two Anomalies in the Ionosphere / Nature 157(3995):691~691
Mehmet Aydoǧdu / 1988 / North-south asymmetry in the ionospheric equatorial anomaly in the African and the West Asian regions produced by asymmetrical thermospheric winds / Journal of Atmospheric and Terrestrial Physics 50(7):623~627
N. Balan / 1995 / Modelling studies of the conjugate-hemisphere differences in ionospheric ionization at equatorial anomaly latitudes / Journal of Atmospheric and Terrestrial Physics 57(3):279~292
Basu S / 1995 / Turbulence in the upper atmosphere: Effects on satellite systems / 33rd Aerospace Sciences Meeting and Exhibit (AIAA)
N.P. Benkova / 1990 / Longitude features shown by topside sounder data and their importance in ionospheric mapping / Advances in Space Research 10(8):57~66
Mehmet Aydoǧdu / 1988 / North-south asymmetry in the ionospheric equatorial anomaly in the African and the West Asian regions produced by asymmetrical thermospheric winds / Journal of Atmospheric and Terrestrial Physics 50(7):623~627
N. Balan / 1995 / Modelling studies of the conjugate-hemisphere differences in ionospheric ionization at equatorial anomaly latitudes / Journal of Atmospheric and Terrestrial Physics 57(3):279~292
Basu S / 1995 / Turbulence in the upper atmosphere: Effects on satellite systems / 33rd Aerospace Sciences Meeting and Exhibit (AIAA)
N.P. Benkova / 1990 / Longitude features shown by topside sounder data and their importance in ionospheric mapping / Advances in Space Research 10(8):57~66
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